git.sesse.net Git - ffmpeg/blob - libavcodec/ljpegenc.c

   1 /*
   2  * lossless JPEG encoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2003 Alex Beregszaszi
   5  * Copyright (c) 2003-2004 Michael Niedermayer
   6  *
   7  * Support for external huffman table, various fixes (AVID workaround),
   8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
   9  *                                  by Alex Beregszaszi
  10  *
  11  * This file is part of FFmpeg.
  12  *
  13  * FFmpeg is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation; either
  16  * version 2.1 of the License, or (at your option) any later version.
  17  *
  18  * FFmpeg is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with FFmpeg; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 /**
  29  * @file
  30  * lossless JPEG encoder.
  31  */
  32
  33 #include "avcodec.h"
  34 #include "dsputil.h"
  35 #include "internal.h"
  36 #include "mpegvideo.h"
  37 #include "mjpeg.h"
  38 #include "mjpegenc.h"
  39
  40
  41 static int encode_picture_lossless(AVCodecContext *avctx, AVPacket *pkt,
  42                                    const AVFrame *pict, int *got_packet)
  43 {
  44     MpegEncContext * const s = avctx->priv_data;
  45     MJpegContext * const m = s->mjpeg_ctx;
  46     const int width= s->width;
  47     const int height= s->height;
  48     AVFrame * const p = &s->current_picture.f;
  49     const int predictor= avctx->prediction_method+1;
  50     const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
  51     const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
  52     int ret, max_pkt_size = FF_MIN_BUFFER_SIZE;
  53
  54     if (avctx->pix_fmt == PIX_FMT_BGRA)
  55         max_pkt_size += width * height * 3 * 4;
  56     else {
  57         max_pkt_size += mb_width * mb_height * 3 * 4
  58                         * s->mjpeg_hsample[0] * s->mjpeg_vsample[0];
  59     }
  60     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0) {
  61         return ret;
  62     }
  63
  64     init_put_bits(&s->pb, pkt->data, pkt->size);
  65
  66     *p = *pict;
  67     p->pict_type= AV_PICTURE_TYPE_I;
  68     p->key_frame= 1;
  69
  70     ff_mjpeg_encode_picture_header(s);
  71
  72     s->header_bits= put_bits_count(&s->pb);
  73
  74     if(avctx->pix_fmt == PIX_FMT_BGR0
  75         || avctx->pix_fmt == PIX_FMT_BGRA
  76         || avctx->pix_fmt == PIX_FMT_BGR24){
  77         int x, y, i;
  78         const int linesize= p->linesize[0];
  79         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
  80         int left[3], top[3], topleft[3];
  81
  82         for(i=0; i<3; i++){
  83             buffer[0][i]= 1 << (9 - 1);
  84         }
  85
  86         for(y = 0; y < height; y++) {
  87             const int modified_predictor= y ? predictor : 1;
  88             uint8_t *ptr = p->data[0] + (linesize * y);
  89
  90             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
  91                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
  92                 return -1;
  93             }
  94
  95             for(i=0; i<3; i++){
  96                 top[i]= left[i]= topleft[i]= buffer[0][i];
  97             }
  98             for(x = 0; x < width; x++) {
  99                 if(avctx->pix_fmt == PIX_FMT_BGR24){
 100                     buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
 101                     buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
 102                     buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
 103                 }else{
 104                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
 105                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
 106                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
 107                 }
 108
 109                 for(i=0;i<3;i++) {
 110                     int pred, diff;
 111
 112                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
 113
 114                     topleft[i]= top[i];
 115                     top[i]= buffer[x+1][i];
 116
 117                     left[i]= buffer[x][i];
 118
 119                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
 120
 121                     if(i==0)
 122                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 123                     else
 124                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 125                 }
 126             }
 127         }
 128     }else{
 129         int mb_x, mb_y, i;
 130
 131         for(mb_y = 0; mb_y < mb_height; mb_y++) {
 132             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
 133                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 134                 return -1;
 135             }
 136             for(mb_x = 0; mb_x < mb_width; mb_x++) {
 137                 if(mb_x==0 || mb_y==0){
 138                     for(i=0;i<3;i++) {
 139                         uint8_t *ptr;
 140                         int x, y, h, v, linesize;
 141                         h = s->mjpeg_hsample[i];
 142                         v = s->mjpeg_vsample[i];
 143                         linesize= p->linesize[i];
 144
 145                         for(y=0; y<v; y++){
 146                             for(x=0; x<h; x++){
 147                                 int pred;
 148
 149                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 150                                 if(y==0 && mb_y==0){
 151                                     if(x==0 && mb_x==0){
 152                                         pred= 128;
 153                                     }else{
 154                                         pred= ptr[-1];
 155                                     }
 156                                 }else{
 157                                     if(x==0 && mb_x==0){
 158                                         pred= ptr[-linesize];
 159                                     }else{
 160                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 161                                     }
 162                                 }
 163
 164                                 if(i==0)
 165                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 166                                 else
 167                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 168                             }
 169                         }
 170                     }
 171                 }else{
 172                     for(i=0;i<3;i++) {
 173                         uint8_t *ptr;
 174                         int x, y, h, v, linesize;
 175                         h = s->mjpeg_hsample[i];
 176                         v = s->mjpeg_vsample[i];
 177                         linesize= p->linesize[i];
 178
 179                         for(y=0; y<v; y++){
 180                             for(x=0; x<h; x++){
 181                                 int pred;
 182
 183                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
 184 //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
 185                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
 186
 187                                 if(i==0)
 188                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
 189                                 else
 190                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
 191                             }
 192                         }
 193                     }
 194                 }
 195             }
 196         }
 197     }
 198
 199     emms_c();
 200
 201     ff_mjpeg_encode_picture_trailer(s);
 202     s->picture_number++;
 203
 204     flush_put_bits(&s->pb);
 205     pkt->size   = put_bits_ptr(&s->pb) - s->pb.buf;
 206     pkt->flags |= AV_PKT_FLAG_KEY;
 207     *got_packet = 1;
 208
 209     return 0;
 210 //    return (put_bits_count(&f->pb)+7)/8;
 211 }
 212
 213
 214 AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
 215     .name           = "ljpeg",
 216     .type           = AVMEDIA_TYPE_VIDEO,
 217     .id             = CODEC_ID_LJPEG,
 218     .priv_data_size = sizeof(MpegEncContext),
 219     .init           = ff_MPV_encode_init,
 220     .encode2        = encode_picture_lossless,
 221     .close          = ff_MPV_encode_end,
 222     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
 223 };